That being said, the Mega Hyper Rare of Mega Charizard X ex was initially more valuable for the Japanese set
Like most Pokmon cards, the value of Houndour depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Obsidian Flames)
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You can read about the Jumpstart format here
Or is your main goal to acquire high-value cards as an investment
While youre busy looking through your bulk, consider trading some of it in to get more singles you know you need